Add "This space" as the default to the search space options

[mararad]

"When using "Search" to add links into a confluence linked drawio diagram, please add "This space" as the default to the search space options.
I expect that most diagrams would have links to pages within the current confluence space, but this is not the default space searched for some reason?"

https://drawio.atlassian.net/browse/DID-198